The youngest of the Kardashian-Jenner clan has basically grown up in front of our eyes, as she was only nine when the show started. However it seems that Kylie doesn't actually like being famous, which is probably why she kept her pregnancy to rapper Travis Scott under the radar.

She's now turning 21 and about to become the youngest self-made billionaire in the world. But how well do you think you know Kylie Jenner? Click through to find out!

30 things you probably didn't know about Kylie Jenner

The KUWTK star turns 21

The youngest of the Kardashian-Jenner clan has basically grown up in front of our eyes, as she was only nine when the show started. However it seems that Kylie doesn't actually like being famous, which is probably why she kept her pregnancy to rapper Travis Scott under the radar.

She's now turning 21 and about to become the youngest self-made billionaire in the world. But how well do you think you know Kylie Jenner? Click through to find out!